Annual report pursuant to Section 13 and 15(d)

Dividends (Detail)

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Dividends (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dividend Declared [Line Items]      
Total dividend paid $ 106,817 [1] $ 97,261 [1] $ 96,522 [1]
First Quarter Dividend
     
Dividend Declared [Line Items]      
Declaration Date Feb. 12, 2013 Feb. 03, 2012 Feb. 24, 2011
Record Date Mar. 04, 2013 Mar. 02, 2012 Mar. 04, 2011
Date Paid Mar. 15, 2013 Mar. 16, 2012 Mar. 16, 2011
Dividends declared per common share $ 0.21 [2] $ 0.21 [2] $ 0.21 [2]
Total dividend paid 24,325 [1] 24,141 [1] 24,056 [1]
Second Quarter Dividend
     
Dividend Declared [Line Items]      
Declaration Date May 24, 2013 May 11, 2012 May 12, 2011
Record Date Jun. 06, 2013 Jun. 04, 2012 Jun. 06, 2011
Date Paid Jun. 20, 2013 Jun. 19, 2012 Jun. 17, 2011
Dividends declared per common share $ 0.21 [2] $ 0.21 [2] $ 0.21 [2]
Total dividend paid 24,348 [1] 24,274 [1] 24,152 [1]
Third Quarter Dividend
     
Dividend Declared [Line Items]      
Declaration Date Aug. 15, 2013 Aug. 08, 2012 Aug. 04, 2011
Record Date Aug. 28, 2013 Aug. 21, 2012 Aug. 17, 2011
Date Paid Sep. 12, 2013 Sep. 05, 2012 Sep. 01, 2011
Dividends declared per common share $ 0.25 [2] $ 0.21 [2] $ 0.21 [2]
Total dividend paid 28,992 [1] 24,281 [1] 24,157 [1]
Fourth Quarter Dividend
     
Dividend Declared [Line Items]      
Declaration Date Nov. 19, 2013 Nov. 06, 2012 Nov. 03, 2011
Record Date Dec. 02, 2013 Nov. 21, 2012 Nov. 18, 2011
Date Paid Dec. 11, 2013 Dec. 07, 2012 Dec. 07, 2011
Dividends declared per common share $ 0.25 [2] $ 0.21 [2] $ 0.21 [2]
Total dividend paid $ 29,152 [1] $ 24,565 [1] $ 24,157 [1]
[1] Of the dividends recorded during 2011, 2012 and 2013, $684, $894 and $772, respectively, were related to outstanding restricted stock units and will not be paid until such units vest. See Note 19.
[2] Beginning with the dividend declared on August 15, 2013, the Company's board of directors raised the quarterly dividend to $0.25 per common share.